Finding the Fourth Proportional to 30,911.10, 42,656.67 and 20,300.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,911.10 : 42,656.67 = 20,300.10 : x
2. Step 2: Convert to fraction form
   30,911.10/42,656.67 = 20,300.10/x
3. Step 3: Cross multiply
   30,911.10x = 42,656.67 × 20,300.10
4. Step 4: Simplify right side
   30,911.10x = 865,934,666.67
5. Step 5: Solve for x
   x = 865,934,666.67/30,911.10
6. Step 6: Final answer
   x = 28,013.71